Addition and Subtraction- No Regrouping
521+74
595
457+123
580
Gordon baked 346 blueberry muffins and 287 bran muffins. How many muffins did he bake in all?
633 muffins
When you _________ 100 from 400, the difference is 300.
subtract
Explain how to estimate the sum of 654 and 142 by rounding to the nearest hundred.
First, round each number to the nearest 100. 654 rounds to 700 because the 5 in the tens place means that 654 is closer to 700 than 600. 142 rounds to 100 because the 4 in the tens place means that 142 is closer to 100 than 200. 700+100=800, so 654+142 is about 800.
878-66
812
772+129
901
The yearbook staff took a total of 905 photographs. They used 487 of the photographs in the yearbook. How many of the photographs were not used?
418 photographs
The number 732 is equal to 6 ________, 13 tens, and 2 ones.
hundreds
Explain where and how to ungroup to do this subtraction problem:
768-575
Ungroup 1 hundred so there are enough tens to subtract 7 tens. 768 ungroups to 6 hundreds 16 tens and 8 ones.
127+651
778
267-199
68
Write a subtraction word problem with the information below. Then solve it, without doing any calculations.
Gordon baked 346 blueberry muffins and 287 bran muffins. He baked 633 muffins in all.
Gordon baked 633 muffins. He baked 346 blueberry muffins and the rest were bran muffins. How many were bran muffins? 287 were bran muffins.
OR
Gordon baked 633 muffins. He baked 287 bran muffins and the rest were blueberry muffins. How many were blueberry muffins? 346 were blueberry muffins.
To find an answer that is close to the exact answer, you can _________.
estimate
Explain a strategy to subtract across zeros in the top number, for example, 700 - any number.
You need to ungroup so there are enough tens and ones to subtract the bottom number. You can turn 700 into 6 hundreds, 9 tens, and 10 ones, then subtract.
735-213
522
800-684
116
Mr. Mike has to read a 362-page book for his club. He read the first 129 pages last week. This week he has read 153 pages. How many pages does he have left to read?
80 pages
sum
Liam has 425 baseball cards. He gave 125 of them to Liliana. Liam's friend Oliver gave him 285 cards. Liam says he now has 833 baseball cards. Is his answer reasonable? Explain. Then find the actual answer to check if you are correct.
No, the answer should be closer to the estimate of 600 because 400-100+300 is 600. The actual answer to 425-125+285 is 585.